Christina Aguilera is craving doughnuts.The 'Dirrty' singer - who is pregnant with her first child - sent husband Jordan Bratman to buy a box of the sugary treats late on Sunday night in Sydney, Australia, where she is on tour.Within minutes of arriving at Sydney airport from Brisbane, Christina's limousine sped to the city's Krispy Kreme store where Jordan purchased two large coffees and a dozen mixed glazed doughnuts.The 25-year-old singer, who was wearing a white scarf, beanie hat and grey hooded top, waited eagerly in the back of the car for her calorific goodies.Christina is in Sydney for the latest leg of her 'Back to Basics' world tour. She has two concerts scheduled at Acer Arena on Tuesday and Wednesday. Earlier this month, Christina's father, Fausto Aguilera, confirmed the pregnancy rumors surrounding his daughter, saying: "I'm so excited. I want Christina to achieve all her goals. I wish her all the happiness in the world."